Surprised to see so many say they'd go ARF over ZZF. I am only casually interested in 6 digit reps and have never owned one, nor do I intend to, but it feels evident to me that the ZZF is the best out-of-the-box rep almost because of its insert alone
The ARF insert is pretty good as well. The ceramic sub is a lot more than just one insert though. Case (rehaut), bracelet, dial and hands seem to be worse on the ZZF. Datewheel is better but the one on newer ARF's (2824 and 3135 v2) is good enough for most people. Crystal seems better but still far from gen.
If if you want to mod the ARF, a simple gen DW and crystal replacement makes it a more compelling final solution. And it's been on the market for a longer time (more positive feedback).
Both seem pretty good and I'm glad we have a new player in the market.
No factory will ever get it perfect, otherwise the entire industry would go out of business.